<!DOCTYPE html>
<html lang="en">
    <head>
        <title>小瑞</title>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
        <style>
            body {
                font-family: Monospace;
                background-color: #f0f0f0;
                margin: 0px;
                overflow: hidden;
            }
        </style>
    </head>
    <body>


        <script src="js/nb.js"></script>

        <script src="js/Projector.js"></script>
        <script src="js/CanvasRenderer.js"></script>

        <script src="js/tween.min.js"></script>
        <script src="js/Sparks.js"></script>

        <!-- load the font file from canvas-text -->

        <script src="js/helvetiker_regular.typeface.js"></script>


        <script>

            var container;

            var camera, scene, renderer;

            var group, text, plane;

            var targetRotation = 0;
            var targetRotationOnMouseDown = 0;

            var mouseX = 0;
            var mouseXOnMouseDown = 0;

            var windowHalfX = window.innerWidth / 2;
            var windowHalfY = window.innerHeight / 2;

            var heartShape, particleCloud, sparksEmitter, emitterPos;
            var _rotation = 0;
            var timeOnShapePath = 0;

            init();
            animate();

            function init() {

                container = document.createElement('div');
                document.body.appendChild(container);


                //相机
                camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
                camera.position.set(0, 150, 800);

                //场景
                scene = new THREE.Scene();

                group = new THREE.Group();
                scene.add(group);

                // Get text from hash

                var string = "xiaorui";
                var hash = document.location.hash.substr(1);

                if (hash.length !== 0) {

                    string = hash;

                }

                var text3d = new THREE.TextGeometry(string, {
                    size: 80,
                    height: 20,
                    curveSegments: 2,
                    font: "helvetiker"

                });

                text3d.computeBoundingBox();
                var centerOffset = -0.5 * (text3d.boundingBox.max.x - text3d.boundingBox.min.x);

                var textMaterial = new THREE.MeshBasicMaterial({color: Math.random() * 0xffffff, overdraw: 0.5});

                text = new THREE.Mesh(text3d, textMaterial);

                // Potentially, we can extract the vertices or faces of the text to generate particles too.
                // Geo > Vertices > Position

                text.position.x = centerOffset;
                text.position.y = 100;
                text.position.z = 0;

                text.rotation.x = 0;
                text.rotation.y = Math.PI * 2;

                group.add(text);


                particleCloud = new THREE.Object3D(); // Just a group
                particleCloud.y = 800;
                group.add(particleCloud);

                // Create Particle Systems

                // Heart

                var x = 0, y = 0;

                heartShape = new THREE.Shape();

                heartShape.moveTo(x + 25, y + 25);
                heartShape.bezierCurveTo(x + 25, y + 25, x + 20, y, x, y);
                heartShape.bezierCurveTo(x - 30, y, x - 30, y + 35, x - 30, y + 35);
                heartShape.bezierCurveTo(x - 30, y + 55, x - 10, y + 77, x + 25, y + 95);
                heartShape.bezierCurveTo(x + 60, y + 77, x + 80, y + 55, x + 80, y + 35);
                heartShape.bezierCurveTo(x + 80, y + 35, x + 80, y, x + 50, y);
                heartShape.bezierCurveTo(x + 35, y, x + 25, y + 25, x + 25, y + 25);

                var hue = 0;

                var hearts = function(context) {

                    context.globalAlpha = 0.5;
                    var x = 0, y = 0;
                    context.scale(0.05, -0.05); // Scale so canvas render can redraw within bounds
                    context.beginPath();
                    // From http://blog.burlock.org/html5/130-paths
                    context.bezierCurveTo(x + 2.5, y + 2.5, x + 2.0, y, x, y);
                    context.bezierCurveTo(x - 3.0, y, x - 3.0, y + 3.5, x - 3.0, y + 3.5);
                    context.bezierCurveTo(x - 3.0, y + 5.5, x - 1.0, y + 7.7, x + 2.5, y + 9.5);
                    context.bezierCurveTo(x + 6.0, y + 7.7, x + 8.0, y + 5.5, x + 8.0, y + 3.5);
                    context.bezierCurveTo(x + 8.0, y + 3.5, x + 8.0, y, x + 5.0, y);
                    context.bezierCurveTo(x + 3.5, y, x + 2.5, y + 2.5, x + 2.5, y + 2.5);
                    context.fill();
                    context.lineWidth = 0.5; //0.05
                    context.stroke();

                }

                var setTargetParticle = function() {

                    var material = new THREE.SpriteCanvasMaterial({
                        program: hearts
                    });

                    material.color.setHSL(hue, 1, 0.75);
                    hue += 0.001;
                    if (hue > 1)
                        hue -= 1;

                    particle = new THREE.Sprite(material);

                    particle.scale.x = particle.scale.y = Math.random() * 40 + 40;
                    particleCloud.add(particle);

                    return particle;

                };

                var onParticleCreated = function(p) {

                    p.target.position.copy(p.position);

                };

                var onParticleDead = function(particle) {

                    particle.target.visible = false;
                    particleCloud.remove(particle.target);

                };

                sparksEmitter = new SPARKS.Emitter(new SPARKS.SteadyCounter(160));

                emitterpos = new THREE.Vector3();

                sparksEmitter.addInitializer(new SPARKS.Position(new SPARKS.PointZone(emitterpos)));
                sparksEmitter.addInitializer(new SPARKS.Lifetime(0, 2));
                sparksEmitter.addInitializer(new SPARKS.Target(null, setTargetParticle));

                sparksEmitter.addInitializer(new SPARKS.Velocity(new SPARKS.PointZone(new THREE.Vector3(0, -50, 10))));

                // TOTRY Set velocity to move away from centroid

                sparksEmitter.addAction(new SPARKS.Age());
                //sparksEmitter.addAction(new SPARKS.Accelerate(0.2));
                sparksEmitter.addAction(new SPARKS.Move());
                sparksEmitter.addAction(new SPARKS.RandomDrift(50, 50, 2000));

                sparksEmitter.addCallback("created", onParticleCreated);
                sparksEmitter.addCallback("dead", onParticleDead);
                sparksEmitter.addCallback("updated", function(particle) {

                    particle.target.position.copy(particle.position);

                });

                sparksEmitter.start();

                // End Particles


                renderer = new THREE.CanvasRenderer();
                renderer.setClearColor(0xf0f0f0);
                renderer.setPixelRatio(window.devicePixelRatio);
                renderer.setSize(window.innerWidth, window.innerHeight);
                container.appendChild(renderer.domElement);

                document.addEventListener('mousedown', onDocumentMouseDown, false);
                document.addEventListener('touchstart', onDocumentTouchStart, false);
                document.addEventListener('touchmove', onDocumentTouchMove, false);

                //

                window.addEventListener('resize', onWindowResize, false);

            }

            function onWindowResize() {

                windowHalfX = window.innerWidth / 2;
                windowHalfY = window.innerHeight / 2;

                camera.aspect = window.innerWidth / window.innerHeight;
                camera.updateProjectionMatrix();

                renderer.setSize(window.innerWidth, window.innerHeight);

            }

            //

            document.addEventListener('mousemove', onDocumentMouseMove, false);

            function onDocumentMouseDown(event) {

                event.preventDefault();

                mouseXOnMouseDown = event.clientX - windowHalfX;
                targetRotationOnMouseDown = targetRotation;

                if (sparksEmitter.isRunning()) {

                    sparksEmitter.stop();

                } else {

                    sparksEmitter.start();

                }

            }

            function onDocumentMouseMove(event) {

                mouseX = event.clientX - windowHalfX;

                targetRotation = targetRotationOnMouseDown + (mouseX - mouseXOnMouseDown) * 0.02;

            }

            function onDocumentTouchStart(event) {

                if (event.touches.length == 1) {

                    event.preventDefault();

                    mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
                    targetRotationOnMouseDown = targetRotation;

                }

            }

            function onDocumentTouchMove(event) {

                if (event.touches.length == 1) {

                    event.preventDefault();

                    mouseX = event.touches[ 0 ].pageX - windowHalfX;
                    targetRotation = targetRotationOnMouseDown + (mouseX - mouseXOnMouseDown) * 0.05;

                }

            }

            //

            function animate() {//更新场景

                requestAnimationFrame(animate);

                render();

            }

            function render() {

                timeOnShapePath += 0.0337;

                if (timeOnShapePath > 1)
                    timeOnShapePath -= 1;

                // TODO Create a PointOnShape Action/Zone in the particle engine
                var pointOnShape = heartShape.getPointAt(timeOnShapePath);

                emitterpos.x = pointOnShape.x * 5 - 100;
                emitterpos.y = -pointOnShape.y * 5 + 400;

                // Pretty cool effect if you enable this
                // particleCloud.rotation.y += 0.05;

                group.rotation.y += (targetRotation - group.rotation.y) * 0.05;
                renderer.render(scene, camera);
            }

        </script>

    </body>
</html>
